| 释义 |
ˈoscillating, ppl. a.
[f. prec. + -ing2.]
1. a. Swinging or moving to and fro, vibrating.
1743Emerson Fluxions 294 If the oscillating Body is not a Globe. 1835Kirby Hab. & Inst. Anim. I. iv. 146 These oscillating plants owe their existence to different species of animalcules. 1899Allbutt's Syst. Med. VI. 681 When the patient's eyes are closed, he may walk in an uncertain oscillating fashion.
b. spec. Applied to machines or parts of them characterized by the oscillatory motion of some part or parts, which in other cases are fixed.
Such are oscillating cylinder, a cylinder in a steam-engine mounted on trunnions and oscillating through a small arc, so that the piston-rod can follow the movements of the crank; oscillating engine, one having an oscillating cylinder; etc.
1821Specif. Manby's Patent No. 4558. 4 A longitudinal section of the oscillating engine. 1870Public Opin. 16 July 81 The turning gear consists of a small supplemental oscillating cylinder. 1875Knight Dict. Mech. 1580/1 Oscillating steam-engines frequently have oscillating valves working in their trunnions. 1882Rep. to Ho. Repr. Prec. Met. U.S. 21 A Huntington oscillating mill is used, crushing about 7 tons of ore per day.
2. Math. Of a series or function (see oscillate v. 4).
1898Harkness & Morley Introd. Theory Analytic Functions viii. 102 Most English text-books regard oscillating series as not divergent. 1973D. G. Ball Introd. Real Anal. iii. 59 Consider the sequence 2½, - 1½, 21/4, - 11/4, 21/8, - 11/8, 21/16, - 11/16,... This sequence is bounded and oscillating.
3. Electronics. Of an electric current or the like: undergoing rapid periodic reversals in direction. Of a circuit or device: characterized by such a current (cf. oscillate v. 1 c).
Oscillating as used of a current implies a much higher frequency than alternating and also a different origin (see oscillator 2 a).
1906A. E. Kennelly Wireless Telegr. viii. 94 (heading) Energy of electric oscillations, or oscillating currents, set up in a vertical receiver. 1920E. W. Stone Elem. Radiotelegr. xi. 44 If two oscillating circuits containing inductance and capacity be..coupled together, they act very differently than when they are allowed to oscillate by themselves. 1948A. L. Albert Radio Fund. x. 386 Variations in the plate output circuit will not be reflected back into the control-grid oscillating circuit. 1974‘I. Drummond’ Power of Bug xi. 166 The tiny transmitter..emitted a high, oscillating signal on ultra short wave. |